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A comparison of NOx adsorption on Na, H and BaZSM-5 films

Indra Perdana (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Derek Creaser (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik) ; Olov Öhrman ; Jonas Hedlund
Applied Catalysis B: Environmental (0926-3373). Vol. 72 (2007), p. 82-91.
[Artikel, refereegranskad vetenskaplig]

NOx adsorption in ZSM-5 films containing Na+, H+ or Ba2+ as counter ions was studied. NaZSM-5 films showed a superior NOx adsorption capacity over the entire temperature range (30-350ºC) in comparison with the other films. Besides the possibility to form strongly bound surface nitrate species, the presence of the Na ions in ZSM-5 resulted in a large enhancement of various weakly adsorbed species. In the HZSM-5 film, the NOx adsorption was mainly due to physisorption, surface nitric acid and nitrosium ion (NO+) formation. Besides weakly adsorbed species and surface nitric acid, the NOx adsorption in BaZSM-5 films also resulted in formation of strongly bound surface nitrate species. The nitrate species in the BaZSM-5 film were found to be resistant to NO exposure and were mainly formed through an NO2 disproportionation pathway.

Nyckelord: NOx adsorption, monolith, ZSM-5 films, counter ions

Denna post skapades 2007-02-13. Senast ändrad 2015-03-30.
CPL Pubid: 26413


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Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)



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NOx Adsorption and Transport in ZSM-5 Films